Maintenance
1903−1/A2
RT-flex50-D
Wärtsilä Switzerland Ltd
1/ 5
Tools: Key to Illustrations:
1 Rod 94005b 1 Cylinder block 12 Bearing girder
2 Pre-tensioning jacks 94180a 2 Intermediate ring 13 Lower backing ring
1 Connection block 94934 3 Upper tie rod nut 14 Lower tie rod nut
1 Hydr. distributor 94934a 4 Cylinder 15 Bush
2 Coupling elements 94934g 5 Piston 16 O-ring
3 HP hoses 94935 6 Vent screw
1 Hydraulic unit 94942 7 Tie rod (M72x6)
8 Protection cover AN Drain slot
9 Screw M24x30 BN Limiting groove
10 Clamp screw KO Slot
11 Column SA Gap
1. General
We recommend that about one year after commissioning the engine all the tie rods
are checked for their correct pre-tensioning and if necessary to tension them to the
specified value. Later it is sufficient to make random checks during major over-
hauls, or the pre-tension of all tie rods has to be checked within four years.
For such checks it is not required to loosen the waisted studs of the main bearings
nor the clamp screws 10 (Fig. ’D’).
Remark: Pay attention to General Application Instructions 9403−4 for hydraulic
pre-tensioning jacks.
2. Checking the pre-tension of tie rods
⇒ Remove protection cover 8 from all tie rods and clean the contact face of inter-
mediate ring 2.
⇒ Place both pre-tensioning jacks 94180a onto two tie rods lying opposite each
other. Screw them completely down with vent screws 6 open until there is only
little or no clearance at ’x’ (Fig. ’A’).
If necessary, turn the pre-tensioning jack back a little so that the holes in the tie
rod nuts are accessible.
⇒ Connect both pre-tensioning jacks with hydraulic unit 94942.
⇒ Actuate the hydraulic unit till bubble-free oil flows out through the vent screws.
Close vent screws.
⇒ Operate hydraulic unit up to 1500 bar and maintain this pressure.
Never move pistons 5 of the pre-tensioning jacks further up than to the red limiting
grooves ’BN’ (Fig. ’A’).
ie Rod
hecking the Pre-tension and Tensioning the Tie Rods with M72x6 Thread Diamete
2011
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